There may be a misunderstanding by some about the significance of the scores in the personality type test. For example the third letter is either T (thinking) or F(feeling). Although relying on thinking in making decisions is usually a good thing, the T score is partially a measure of the balance one places on thinking as opposed to consideration of people's feelings. A high T score can indicate that you are unaware of the importance of people's feelings. Just as a high F score can indicate that you do not consider factual analysis enough. In addition, the amount of thinking you rely on does not speak to the quality of that thinking. A high T score, for example, does not indicate high inteligence anymore than a high F score indicates inferior inteligence.
Other letters in the score are similarly measures of balance along a continuum.
Although some people's personalities may be well defined by their answers to a few dozen questions, most people have personalities that are more complex than that. People with personalities that do not conform to the simple tests often find that most questions cannot be answered in a definative manner. If the question is answered with respect to one issue or one aspect of their life they would give one answer, while if they think about another part of their life they may provide a different answer. Many people's scores and even letter designation will vary significantly if they take the test twice -- especially if the test times are more than a day apart.
You can evaluate how well your personality conforms to the test by taking the test multiple times -- once while considering your interactions and decisions related to your closest friends and family, and a second time while considering physics or engineering, another time while considering finances, politics, etc.